William emmett



@uiten tats @anni @fitug WILLIAM EMMETT, CE PirrEnsCE,` NEW JERSEY,4 AssieNCE To HiMsELF AND s. HCETCN, CE-WINDSOR Locus, CONNECTICUT.

Leners Patent No. eueeaaafefz August 1s, isos.

IMPROVEMENT IN LATHE-DOG.

TO ALL WHOM IT MAY CONGERN:

- 'Be it known that I, WIL-LIAM EMMETT, of Paterson, in the county ot' Passaic, and State ot' New Jersey, have invented certain new and useful Improvements in Dogs for Lathes and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable 'others skilled in the art to make and use thesame, reference being had to the accompanying drawings, lforming partv of this specification.

The present invention consistsi First, in providing the frame of the ordinarydog to a lathe with a frame, arranged to play o r'slide thereon in'such manner, with relation thereto, as to have a motion for the entire length, if not beyond the inclined sides of .the dog-frame, against which, in the ordinary dog, the article to be turnedis pressed, and held by the setscrew of the dog, whereby the dog is rendered more universal in its application, more certain, sure, and reliable in its hold upon the article placed in it to be turned.

Second, iu providing theatljustable slide-frame, hereinabove referred to, for the dog, with angular extensionarms, meeting at a common point in the centre line ofthe dog, and there,by a lug adapted tomovein aguidinggroove or way ofthe dog-frame, for the purpose of avoidingany lateral play ,of the adjustable, slide-frame vupon the dog, as it is moved upon thedog,iand imparting a more steady, stiff, strong, and, rigid action when grasping the articlein the dog. I I .I I'

I Third, 'in constructing the adjustable slide so as to embrace bothY sides of the dog-frame; and

Lastly, in a novel construction, whereby the slide can be applied to and fastened upon the dog, so as to embrace both its sides.

In the accompanying plate of drawings my improvements -in dogs for lathes are illustrated#- Figure I being aface view of a dog constructed thereto.

Figure 2, a central longitudinal section, taken in the plane ot the line a; x, iig. 1.

Figure 3, a transverse section, taken in the plane of the line y y, iig. I.

A, in the drawings, reprcsents'a dog, formed of a frame, B, provided` with set-screw, C, internal angular sides, D, and pinion-shank, E, by which it is hung in the 1athe=plate, as in ordinary lathe-dogs.

F, a slide-frame,.arranged upon the outside o f dog-'frame B, which it embraces upon both sides. This frame is made in two parts br plates, G and II, that have similar angular or inclinedvsides, I, and before being joined together are placed, the one upon the one side of the dog-frame B, and the other upon the other side ofl the same, with the Studer projection J of the one passing through an opening'made in the other to receive it. When upsetting the projecting end of' such stud, the two parts will be. rivotedfas it were, together, and thus drnily joined, or made as one piece. I

Y When the two-part frame F is plaeedhpou the dog-frame B, the angular sides I of cach part correspond i v-in position, and are opposite to the angular sides of the dog-frame B, so that if the set-screw C be turned in the proper direction .to force the slide-frame F toward -the angular sides of the-dog-frame A, whatever article may have been .placed within the openingL, between its angular sides D and those of-'the slide, will be firmly heldand boundbetween them, and not only in thedirection of the. length of the dog, but transversely thereto, vas is obvious. V One`ot`- the plates to the slide-frame has angulaiextension-arins, M, meeting in the centre line ofthe dog, -whcrc they are joined o-r'made as one, and have a lug, N, that'projects into the centre longitudinal groove 0 of the dog. By this construction, not only is the slide-frame of thedog stilened and strengthened, but it, can

have .no side or lateral play-two vcry'important advantages.

- With the arrangement o' a slide-frame'upon the outside of a lathe-dog, as hereinabove explained, in additioiito the advantage secured thereby, as before' stated,l it may be here'obscrved that it-e-nables the dog to be adaptedior a greater variety of sizes, as by that arrangement the slide can be passed by the angular sides ot"4 fthe dcg, even to their entire length,ro r, in other words, to the smallest possible distance-from their apex, if to receive small arti-cles.

That, furthermore, by means of the generalconstruction of the dog herein described, the Weight of metal composing it is enabled to beso disposed that, whatever be the position of the slide upon the dog, the dog will be always evenlyrbalanced, or near enouglrfor allpractical purposes-a result of much importance.

And that, furthermore, with the use of my improved dog, no injury can result or occur'to any article placed ltherein, however nicely finished it maybe previous to its insertion.

Having thus described my improvements, what I claim, is`

The construction and arrangement of the dogframc B, having angular sides D, pinion-shank E, and groove O, the set-screw C, sliding frame E, consisting of' plates G H, with inclined sides I, stud or projection J, extensiomarms M, and lug N, and `operating substantially as and for the' purpose described WILL. EMMETT. lWitnesses:

. ANDW MEAD,

JACOB BIBBY. 

